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频谱分析是空间滤波的一种。本文使用光学傅里叶变换分析SAR图像的空间频率特征。从取得的功率谱与功率谱角分布数据中可以:(1)确定与雷达后向散射方向有关面的走向最大(最小)方位角;(2)分析频谱曲线两个峰的夹角及其地学意义;(3)推算其水系密度;(4)研究样区地形基本特征。 这些资料有助于研究线性构造区域展布特征,岩类识别和地貌分类等。
Spectrum analysis is a kind of spatial filtering. This paper uses optical Fourier transform to analyze the spatial frequency characteristics of SAR images. From the obtained power spectrum and power spectral angle distribution data, we can: (1) determine the maximum (minimum) azimuth of the direction related to the backscattering direction of the radar; (2) analyze the angle between two peaks of the spectrum curve and its geoscience Significance; (3) Calculating the density of water system; (4) Studying the basic features of topography of the sample area. These data help to study the distribution of linear tectonic features, rock identification and geomorphological classification.